A full pitch motor stator

Abstract

The present invention provides a full-pitch motor stator, comprising an iron core and a stator winding wound on the iron core. Since the winding coils wound in the same stator slot belong to the same phase, and in the same stator slot, the fourth layer and the second layer are wound by the first winding coil, and the first layer and the third layer are wound by the second winding coil, two neutral point connecting lines in the same phase are connected in parallel, the structure is relatively compact, and it is helpful to reduce the end height of the winding, thereby reducing the volume of the motor without changing the power, and achieving high power and relatively small volume. In addition, the use of six-phase windings can expand the selection range of voltage and current, adapt to a variety of controllers, thereby optimizing the performance and cost of the motor system, and can improve the efficiency and torque density of the motor, while having the characteristics of strong fault tolerance and high reliability.

Description

Technical Field

[0001] The invention relates to an internal part of a motor, in particular to a full-pitch motor stator. Background Art

[0002] With the rapid development of automobile technology, especially electric vehicle technology, the power requirements for automotive electric motors are also increasing. The increase in power will inevitably lead to an increase in the size of the motor. However, there are more and more various devices on current cars, and the installation locations provided for electric motors are becoming increasingly narrow and crowded. In a limited space, the power of existing electric motors can no longer meet the demand. Therefore, the contradiction between the size and power of electric motors has become a technical problem in the research and development of high-power electric motors.

[0003] The Chinese utility model patent with publication number CN205453323U discloses a motor stator using flat copper wire, which greatly improves the slot fill rate of the motor stator by replacing the traditional round copper wire with flat copper wire. After winding, the structure is compact and the output power is high. To a certain extent, it can solve the contradiction between the size and power of the motor, but it still needs further improvement to meet more vehicle installation requirements. At the same time, because the motor stator uses a three-phase winding, the selection range of voltage and current is relatively narrow, and the fault tolerance and reliability are relatively low.

[0004] In view of this, the inventor conducted an in-depth study on the above-mentioned problem, and thus the present invention was produced. Summary of the invention

[0005] The object of the present invention is to provide a full-pitch motor stator with relatively large power and relatively small volume, relatively wide voltage and current selection range, and relatively high fault tolerance and reliability.

[0006] In order to achieve the above object, the motor stator of the present invention adopts the following technical solution:

[0007] A full-pitch motor stator comprises an iron core and a stator winding wound on the iron core, wherein 48 stator slots are opened at equal intervals on the iron core, and insulating paper is arranged in the stator slots, and the insulating paper divides the stator slots into a first layer, a second layer, a third layer and a fourth layer in sequence from the outside to the inside in the radial direction of the iron core, and the stator winding has eight magnetic poles and is a six-phase winding, and each phase of the stator winding comprises a first winding coil and a second winding coil, and the first ends of the first winding coil and the second winding coil both form lead wires, and the tail ends both form neutral point connecting wires, and the winding coils wound in the same stator slot belong to the same phase, and in the same stator slot, the fourth layer and the second layer are wound by the first winding coil, and the first layer and the third layer are wound by the second winding coil, and the two neutral point connecting wires in the same phase are connected in parallel.

[0008] As an improvement of the present invention, in the same phase, the winding starting ends of the first winding coil and the second winding coil are located in the same stator slot, and the winding directions of the first winding coil and the second winding coil are opposite.

[0009] As an improvement of the present invention, in the same phase, there are five stator slots between two adjacent stator slots wound with the first winding coil or the second set of coils.

[0010] As an improvement of the present invention, the first winding coil is wound around the iron core with two turns, wherein the first turn is alternately wound around the fourth layer and the third layer of the corresponding stator slots, and the second turn is alternately wound around the second layer and the first layer of the corresponding stator slots;

[0011] The second winding coil is wound around the iron core twice, wherein the first turn is alternately wound around the first layer and the second layer of the corresponding stator slots, and the second turn is alternately wound around the third layer and the fourth layer of the corresponding stator slots.

[0012] As an improvement of the present invention, the winding start end of the first winding coil is located at the fourth layer of the corresponding stator slot, and the winding start end of the second winding coil is located at the first layer of the corresponding stator slot.

[0013] As an improvement of the present invention, with the starting end of the first winding coil in each phase as the starting end of the corresponding phase, the six-phase windings of the stator winding are respectively U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding, with the starting ends arranged in sequence clockwise or counterclockwise, wherein the stator slot where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end of the A-phase winding is located, the stator slot where the starting end of the V-phase winding is located is adjacent to the stator slot where the starting end of the B-phase winding is located, the stator slot where the starting end of the W-phase winding is located is adjacent to the stator slot where the starting end of the C-phase winding is located, and there are three stator slots between the stator slot where the starting end of the U-phase winding is located and the stator slot where the starting end of the V-phase winding is located, and between the stator slot where the starting end of the V-phase winding is located and the stator slot where the starting end of the W-phase winding is located.

[0014] As an improvement of the present invention, the neutral point connecting lines of the U-phase winding, the V-phase winding and the W-phase winding are connected to each other, and the neutral point connecting lines of the A-phase winding, the B-phase winding and the C-phase winding are connected to each other.

[0015] As an improvement of the present invention, the first winding coil and / or the second winding coil includes at least one conducting wire with an elliptical or square cross-section.

[0016] As an improvement of the present invention, each of the lead wires and each of the neutral point connecting wires are located on the same side of the iron core.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects:

[0018] 1. Since the winding coils wound in the same stator slot belong to the same phase, and in the same stator slot, the fourth and second layers are wound by the first winding coil, and the first and third layers are wound by the second winding coil, the two neutral point connecting lines in the same phase are connected in parallel, the structure is relatively compact, and it is helpful to reduce the end height of the winding, thereby reducing the volume of the motor without changing the power, achieving higher power and relatively smaller volume. In addition, the use of six-phase windings can expand the selection range of voltage and current, adapt to a variety of controllers, thereby optimizing the performance and cost of the motor system, and can improve the efficiency and torque density of the motor, while having the characteristics of strong fault tolerance and high reliability.

[0019] 2. By using wires with elliptical or square cross-sections, the motor stator slot fill rate is effectively increased, the material utilization rate of the stator is improved, and the copper loss of the motor is reduced to improve the efficiency of the motor. The end height of the motor winding coil can be effectively reduced, thereby saving the volume of the motor.

[0020] 3. The connection structure of the neutral point connecting line adopted in the present invention helps to further improve the efficiency and torque density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a partial structure of an iron core in an embodiment;

[0022] Figure 2 Schematic diagram of the expanded structure of the U-phase winding and the A-phase winding in the embodiment;

[0023] Figure 3 Schematic diagram of the expanded structure of the V-phase winding and the B-phase winding in the embodiment;

[0024] Figure 4 Schematic diagram of the expanded structure of the W-phase winding and the C-phase winding in the embodiment;

[0025] Figure 5 Schematic diagram of the connection structure of the neutral point connection lines of the U-phase winding, the V-phase winding and the W-phase winding in the embodiment;

[0026] Figure 6 Schematic diagram of the connection structure of the neutral point connecting lines of the A-phase winding, the B-phase winding and the C-phase winding in the embodiment.

[0027] The corresponding markings in the figure are as follows:

[0028] 100- iron core; 110- stator slot; DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 1-Figure 6 As shown, the present embodiment provides a full-pitch motor stator, including an iron core 100 and a stator winding wound on the iron core, wherein 48 stator slots 110 are evenly spaced on the iron core 100, and the shape of the stator slots 110 can be a conventional shape, such as a rectangular slot, and each stator slot 110 is provided with insulating paper, which is also the insulating paper used in conventional motor stators. The insulating paper divides the corresponding stator slots into a first layer, a second layer, a third layer and a fourth layer from the outside to the inside in the radial direction of the iron core 100, and each layer is used to wind the stator coil, that is, one slot and four wires. In order to distinguish the stator slots 110 at different positions, in the present embodiment, starting from any stator slot 110, the stator slots 110 are numbered from the 1st slot to the 72nd slot in a counterclockwise direction. In addition, in order to distinguish the numbering of the stator slots 110 from the numbering of the parts of the motor stator, in the present embodiment and the attached drawings, the stator slots 110 are numbered from the 1st slot to the 72nd slot in sequence. Figure 1-Figure 6 In FIG. 1 , the three-digit number indicates the part number of the motor stator, and the one-digit and two-digit numbers indicate the number of the stator slot 110 .

[0031] The stator winding has eight magnetic poles and is a six-phase winding. The six-phase windings of the stator winding are respectively arranged in clockwise or counterclockwise order: U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding.

[0032] Each phase of the stator winding includes a first winding coil and a second winding coil. The first ends of the first winding coil and the second winding coil form lead wires, and the tail ends form neutral point connection wires. For ease of description, the first winding coils of the U-phase winding, the A-phase winding, the V-phase winding, the B-phase winding, the W-phase winding, and the C-phase winding are respectively U1, A1, V1, B1, W1, and C1, and the second winding coils of the U-phase winding, the A-phase winding, the V-phase winding, the B-phase winding, the W-phase winding, and the C-phase winding are respectively U2, A2, V2, B2, W2, and C2. The first winding coil and the second winding coil are both formed by welding hairpin-type plug-ins to each other. The coils formed by welding hairpin-type plug-ins to each other are widely used in various automotive motor stators, but are not the focus of this embodiment and will not be described in detail here.

[0033] Preferably, the first winding coil and / or the second winding coil include one or more conductors with an elliptical or square cross-section. In this embodiment, flat copper wires are used, i.e., copper wires with an elliptical or square cross-section. Flat copper wires are easy to install, have good stability, and are conducive to improving the slot fill rate of the stator winding. In addition, each lead wire and each neutral point connection wire are located on the same side of the iron core 100 for easy connection.

[0034] The winding coils wound in the same stator slot 110 belong to the same phase, and in the same stator slot 110, the fourth layer and the second layer are wound by the first winding coil, and the first layer and the third layer are wound by the second winding coil. Preferably, in the same phase, the starting ends of the first winding coil and the second winding coil (i.e., the positions wound in the stator slot 110 and directly connected to the lead-out wires) are located in the same stator slot 110, and the winding directions of the first winding coil and the second winding coil are opposite, and there are five stator slots 110 between two adjacent stator slots 110 wound with the first winding coil or the second set of coils. Further, the first winding coil is wound around the iron core 100 with two turns, wherein the first turn is alternately wound around the fourth layer and the third layer of each corresponding stator slot 110, and the second turn is alternately wound around the second layer and the first layer of the corresponding stator slot 110, that is, after the first turn is wound, the second turn is started from the second layer of the stator slot 110 where the winding start end is located; the second winding coil is also wound around the iron core 100 with two turns, wherein the first turn is alternately wound around the first layer and the second layer of each corresponding stator slot 110, and the second turn is alternately wound around the third layer and the fourth layer of the corresponding stator slot 110, that is, after the first turn is wound, the second turn is started from the third layer of the stator slot 110 where the winding start end is located; and the winding start end of the first winding coil is located at the fourth layer of the corresponding stator slot 110, and the winding start end of the second winding coil is located at the first layer of the corresponding stator slot 110. In addition, taking the starting end of the first winding coil in each phase as the starting end of the corresponding phase, the stator slot 110 where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end 110 of the A-phase winding is located (that is, there is no other stator slot 110 between the two stator slots 110), the stator slot 110 where the starting end of the V-phase winding is located is adjacent to the stator slot 110 where the starting end of the B-phase winding is located, the stator slot 110 where the starting end of the W-phase winding is located is adjacent to the stator slot 110 where the starting end of the C-phase winding is located, and there are three stator slots 110 between the stator slot 110 where the starting end of the U-phase winding is located and the stator slot 110 where the starting end of the V-phase winding is located, as well as between the stator slot 110 where the winding end of the V-phase winding is located and the stator slot 110 where the winding end of the W-phase winding is located.

[0035] Specifically in this embodiment, U1 is wound counterclockwise, and its winding start end is located at the fourth layer of the seventh slot, then its winding stop end (that is, the position wound in the stator slot 110 and directly connected to the neutral point connecting line) is located at the first layer of the first slot, U2 is wound clockwise, and its winding start end is located at the first layer of the seventh slot, then its winding stop end is located at the fourth layer of the thirteenth slot, A1 is wound counterclockwise, and its winding start end is located at the fourth layer of the eighth slot, then its winding stop end is located at the first layer of the second slot, A2 is wound clockwise, and its winding start end is located at the first layer of the eighth slot, then its winding stop end is located at the fourth layer of the fourteenth slot, V1 is wound counterclockwise, and its winding start end is located at the fourth layer of the eleventh slot, then its winding stop end is located at the first layer of the fifth slot, and V2 is wound clockwise, and its winding start end is located at the first layer of the eleventh slot. layer, then its stop winding end is located at the fourth layer of the 17th slot, B1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 12th slot, then its stop winding end is located at the first layer of the 6th slot, B2 is wound clockwise, and its starting winding end is located at the first layer of the 12th slot, then its stop winding end is located at the fourth layer of the 18th slot, W1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 15th slot, then its stop winding end is located at the first layer of the 9th slot, W2 is wound clockwise, and its starting winding end is located at the first layer of the 15th slot, then its stop winding end is located at the fourth layer of the 21st slot, C1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 16th slot, then its stop winding end is located at the first layer of the 10th slot, C2 is wound clockwise, and its starting winding end is located at the first layer of the 16th slot, then its stop winding end is located at the fourth layer of the 22nd slot.

[0036] like Figure 5 and Figure 6 As shown, the two neutral point connection lines in the same phase are connected in parallel, and the neutral point connection lines of the U-phase winding, the V-phase winding and the W-phase winding are connected to each other, and the neutral point connection lines of the A-phase winding, the B-phase winding and the C-phase winding are connected to each other.

[0037] The present invention is described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, which all belong to the protection scope of the present invention.

Claims

1. A full-pitch motor stator, comprising an iron core and a stator winding wound on the iron core, wherein 48 stator slots are evenly spaced on the iron core, characterized in that: Insulating paper is arranged in the stator slot, and the insulating paper divides the stator slot into a first layer, a second layer, a third layer and a fourth layer in sequence from the outside to the inside in the radial direction of the iron core. The stator winding has eight magnetic poles and is a six-phase winding. Each phase of the stator winding includes a first winding coil and a second winding coil. The first ends of the first winding coil and the second winding coil form lead wires, and the tail ends form neutral point connecting wires. The winding coils wound in the same stator slot belong to the same phase, and in the same stator slot, the fourth layer and the second layer are wound by the first winding coil, and the first layer and the third layer are wound by the second winding coil. The two neutral point connecting lines in the same phase are connected in parallel.

2. The full-pitch motor stator according to claim 1, characterized in that: In the same phase, the winding starting ends of the first winding coil and the second winding coil are located in the same stator slot, and the winding directions of the first winding coil and the second winding coil are opposite.

3. The full-pitch motor stator according to claim 2, characterized in that: In the same phase, five stator slots are spaced between two adjacent stator slots around which the first winding coil or the second winding coil is wound.

4. The full-pitch motor stator according to claim 3, characterized in that: The first winding coil is wound around the iron core twice, wherein the first coil is alternately wound around the fourth layer and the third layer of the corresponding stator slots, and the second coil is alternately wound around the second layer and the first layer of the corresponding stator slots; The second winding coil is wound around the iron core twice, wherein the first turn is alternately wound around the first layer and the second layer of the corresponding stator slots, and the second turn is alternately wound around the third layer and the fourth layer of the corresponding stator slots.

5. The full-pitch motor stator according to claim 4, characterized in that: A winding start end of the first winding coil is located at the fourth layer of the corresponding stator slot, and a winding start end of the second winding coil is located at the first layer of the corresponding stator slot.

6. The full-pitch motor stator according to any one of claims 1 to 5, characterized in that: Taking the starting end of the first winding coil in each phase as the starting end of the corresponding phase, the six-phase windings of the stator winding are respectively U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding, whose starting ends are arranged in a clockwise or counterclockwise order, wherein the stator slot where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end of the A-phase winding is located, the stator slot where the starting end of the V-phase winding is located is adjacent to the stator slot where the starting end of the B-phase winding is located, the stator slot where the starting end of the W-phase winding is located is adjacent to the stator slot where the starting end of the C-phase winding is located, and there are three stator slots between the stator slot where the starting end of the U-phase winding is located and the stator slot where the starting end of the V-phase winding is located, and between the stator slot where the starting end of the V-phase winding is located and the stator slot where the starting end of the W-phase winding is located.

7. The full-pitch motor stator according to claim 6, characterized in that: The neutral point connection lines of the U-phase winding, the V-phase winding, and the W-phase winding are connected to each other, and the neutral point connection lines of the A-phase winding, the B-phase winding, and the C-phase winding are connected to each other.

8. The full-pitch motor stator according to any one of claims 1 to 5, characterized in that: The first winding coil and / or the second winding coil includes one or more wires with an elliptical or square cross section.

9. The full-pitch motor stator according to any one of claims 1 to 5, characterized in that: Each of the lead wires and each of the neutral point connecting wires are located on the same side of the iron core.

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